Remote field ECT for evaluation of local wall thinning using pancake coils

Toshihiro Yamamoto, Toshiyuki Takagi, Tetsuya Uchimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The remote field eddy current testing (RFECT) is usually used for inspection of ferromagnetic small tubes with bobbin coils. As a new aspect of RFECT, YuShi Sun introduced RFECT for flat plates using pancake coils. However, a principle of RFECT using pancake coils is still unclear, and a few studies on this kind of RFECT have been reported so far. The aim of this study is to evaluate detection and sizing capabilities of RFECT using pancake coils especially for applying this technique to evaluation of local wall thinning in large diameter pipes from the outside. The present paper shows relationships between detection signals and defect shapes obtained by numerical simulations, and also compares one of the numerical results with a corresponding actual experimental result. The results indicate the possibility of estimating a defect shape from detection signals and the possibility of detecting a defect with a relatively large lift-off height or on the bottom side of double plates.

Original languageEnglish
Title of host publicationElectromagnetic Nondestructive Evaluation (XIII)
EditorsJeremy Knopp, Mark Blodgett, Jeremy Knopp, Mark Blodgett, Buzz Wincheski, Nicola Bowler, Buzz Wincheski, Nicola Ames
Number of pages6
Publication statusPublished - 2010

Publication series

NameStudies in Applied Electromagnetics and Mechanics
ISSN (Print)1383-7281
ISSN (Electronic)1879-8322


  • Local wall thinning
  • Pancake coil
  • Remote field ECT

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Remote field ECT for evaluation of local wall thinning using pancake coils'. Together they form a unique fingerprint.

Cite this